Cakes & Frostings 1:1
Cake Soaking Syrup Calculator
Moist layers start with a good soak. Find how much syrup to brush on each layer for butter cakes, sponges and génoise, and make it with the right sugar, water and flavor.
How to use it
- Choose the cake size and how many layers you'll soak.
- Pick the cake type, how moist you want it and the syrup strength.
- Make the syrup, cool it, and brush the amount shown onto each layer.
How it works
Syrup needs scale with the area of each layer: about 0.8 mL per square inch for butter cake, roughly twice that for génoise, which is made to be soaked. The total includes 10% to spare.
Sugar and water are worked out so the finished syrup comes to the right volume: dissolved sugar takes up less room, so 1 cup of sugar and 1 cup of water make about 1½ cups.
Assumptions and limits
- Amounts are typical; drier sponges can take more.
- Syrup is used at room temperature on cooled layers.
Tips
- Brush to the edges, where cakes dry first.
- A squeeze bottle gives an even soak on large layers.
- Steep the vanilla bean in the warm syrup for the most flavor.
Recipes to try it with
Questions
How much simple syrup for an 8-inch cake layer?
About 3 tablespoons for butter cake and ⅓ cup for a sponge or génoise layer.
What ratio of sugar to water for cake syrup?
Equal parts (1:1) is classic. A lighter 1:2 syrup adds moisture with less sweetness.
Can I soak a cake the day before?
Yes. Soak, wrap and chill the layers overnight; they assemble more neatly cold.
How do I flavor cake syrup?
Steep a split vanilla bean in the warm syrup, or stir in extract, liqueur, espresso or citrus once it cools.